Barge battles pesky invaders

Cargo ships discharge thousands of gallons of ballast water containing millions of non-native species in global ports. A barge in Baltimore harbor brings business and environmentalists together to fight this potential environmental disaster. AP video. (June 13)

Cargo ships discharge thousands of gallons of ballast water containing millions of non-native species in global ports. A barge in Baltimore harbor brings business and environmentalists together to fight this potential environmental disaster. AP video. (June 13)

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Cargo ships discharge thousands of gallons of ballast water containing millions of non-native species in global ports. A barge in Baltimore harbor brings business and environmentalists together to fight this potential environmental disaster. AP video. (June 13)